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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9177ATR датащи(PDF) 38 Page - STMicroelectronics |
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L9177ATR датащи(HTML) 38 Page - STMicroelectronics |
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38 / 55 page  Figure 32. Input-output behaviour of VRS interface 0.1 0.15 VRS voltage [V] threshold Squared signal hysteresis 0.05 0.0 -0.05 -0.1 0.8 1 0.6 0.4 0.2 0 0.53 0.535 DT1 DT2 DT2<Tf Tf Tf = Filtering time DT2>Tf 0.54 0.545 0.55 0.555 0.56 0.53 0.535 0.54 0.545 0.55 0.555 0.56 GAPGPS00615 3.6.3 Auto-adaptative time filter This characteristic is useful to set the best internal filter time as function of the input signal frequency. The Tfilter time depends on the previous period duration Tn according to the following formula: Tfilter(n+1) = 1/32 * Tn if Tn > Tfilter(n) The filtering time purpose is to filter very short spikes. The digital filtering time is applied to internal squared signal (int_vrs), obtained by voltage comparators. The output of time filtering block is out_vrs signal. The filtering time Tfilter is applied to int_vrs signal in two different ways: • Rising edge: if int_vrs high level lasts less than Tfilter, out_vrs is not set to high level. • In absence of any spikes during input signal rising edge out_vrs signal is expected with a delay of Tfilter time. • Falling edge: the falling edge of int_vrs is not delayed through time filtering block: after falling edge for a time Tfilter any other transition on int_vrs signal is ignored The initial value (Default) and maximum for Tfilter must be considered at RPM_min = 20 e.g. Tmax filter = 180 µs. The minimum available value is Tmin filter = 2.8 µs. L9177A VRS interface DS12175 - Rev 5 page 38/55 |
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